Fits a 4-½ in. Vice. Has cutouts for small 10mm x 4mm magnets.
Vice: https://www.homedepot.com/p/BESSEY-4-1-2-in-Light-Duty-Bench-Vise-with-Swivel-Base-BV-HW45/205023078
Magnets: https://www.amazon.com/gp/product/B08Y5YZN5C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1